Support bracket for key box



FIG. 1 is a left side and front perspective view of a support bracket for a key box showing my new design;

FIG. 2 is a left side elevational view thereof, the side opposite being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is left side and front perspective view of a second embodiment thereof;

FIG. 5 is a side elevational view thereof, the side opposite being a mirror image; and

FIG. 6 is a top plan view thereof. 

The ornamental design for a support bracket for key box, as shown and described. 